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r � r rr r r Ir r r r r ire r r r r rr rr r ' a i • i Table 9 C-Sparge System Pilot Test Groundwater Chemical Analytical Data Former Unocal Service Station#0187 437 East Miner Avenue, Stockton i Sample DO TPH9 Benzene Toluene Ethylbenzene Xylenes MTBE i Well ID Date (ppm) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) `f NP-1-22 11120-221001'1 ---- 16,700121 1,010 102 1,800 2,230 -2501<20.0131 12107/001'1 ---- 16,8001�1 1,100 100 1,860 2,040 ---- Baseline 1218100 2.69 12,000 740 51 1,200 1,200 <130 12/19/00 3.89 7,200 580 69 630 1,000 230 12/26100 4.92 9,600 478 <50.0 201 974 <250 01/02/01 ---- 10,200 455 <50.0 123 980 285 01/09/01 3.42 1,480 44.4 <5.00 15.7 50.3 <25.0 01/16/01 1.43 5,380 170 20.4 61.2 296 58.8 01/23/01 1.51 5,500 111 <50.0 78.6 292 <250 01/30/01 2.36 5,070 110 <50.0 58.6 202 <250 02/06/01 2.31 6,700 121 <5.00 112 370 <25.0 02/13/01 1.64 5,340 95.0 22.1 114 233 Ill 02/21101 2.77 5,900 177 <50.0 151 291 <25.0 2126-27101111 ---- 5,340 98.5 9.97 83.9 307 9.7616.6131 03/06/01 4.60 1,530 60.8 <5.00 42.8 129 <25.0 03/13/01 2.22 3,010 109 <10.0 129 284 453 03/27/01 1.87 5,470 151 11.9 243 532 166 04/10/01 2.23 6,230 91.4 <20.0 288 579 <100 04/24/01 1.81 5,810 123 <50.0 230 533 <250 05/08/01 2.16 8,290 173 <20.0 261 793 178 5114-16/01111 ---- 8,700121 161 27.6 181 693 <25016.70131 05/22101 1.95 6,540 213 19.8 221 580 37.3 06/05/01 ---- 5,700 210 <25 200 660 <120 06/19/01 2.51 6,100 89 <20 250 760 <100 07/03/01 2.92 5,900 210 <50 280 790 <250 07/17/01 2.48 5,700 240 <50 320 850 <250 07/31/01 ---- 8,800 190 34 280 850 <25 08113-151011' ---- 9,100121 200 45 300 920 <100/<10131 11/26-281011'1 ---- 7,500121 190 63 220 740 <250/2.01" 02!25-271021'1 ---- 12,000141 260 63 410 1,200 <200/2.1131 06940-325 1 ENSR Corporation i I